Add CDS introspection data provider configuration to docs

[Akila94]

Affected OB version:

CDS toolkit

Affected OB specifications:

CDS

Existing pages to be updated:

https://cds.ob.docs.wso2.com/en/latest/install-and-setup/configuring-identity-server-for-ob/

Description (Optional):

Need to add the following configuration under [open_banking.identity.extensions] tag of deployment.toml file of the identity server in order to return the cdr_arrangement_id with the refresh token introspection response.

[open_banking.identity.extensions]
introspection_data_provider="com.wso2.openbanking.cds.identity.listener.CDSIntrospectionDataProvider"

Instructions:

References:

Related issue: #889

Labels:

CDS